This happiness index is for how happy the planet is, and it appears that Central America wins. most likely by having less people and some forests.
toss up. lots of European countries on either side of the US here. The only relevant one to the discussion is the firearm stats. the US is the only country with recent updates and full stats. apples to oranges, and it feels manipulated to make the US look bad.
the US life expectancy is below cuba! and chile. and costa rica. While they may be nice places(the planet is happy enough there!), I believe that there may be some reporting discrepancies here
Conclusion: This appears to be a bunch of references that hope to make the US look bad. As long as no one actually reads them. Wait, no I forget--of course Europe is better!